Dolweave

Dolweave is a coarse, sickly fabric that is rumored to be woven with occasional hairs collected from dolgrims, dolgaunts, and other corruptions. The color and texture of dolweave seems to darken and pulse threateningly in time to its wearer’s most violent emotions. A character wearing dolweave gains a +1 circumstance bonus on Intimidate checks. Dolweave clothing costs 150 gp more than a normal outfit of the same sort, and weighs 1 pound more (or 1/4 pound more for Small characters).

Source: Magic of Eberron